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Finance Calc Kit
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Debt Consolidation Calculator

Compare your current multiple debt payments against a consolidated loan to see monthly savings and total interest saved.

Consolidation Loan Terms

Set the interest rate and repayment term for your new consolidated personal loan.

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mo
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Current Debt #1

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$

Current Debt #2

$
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$

Current Debt #3

$
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$

Current Debt #4

$
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$

Total interest saved

$4,924.92

Total net savings: $4,924.92

Consolidated Loan Summary

New Monthly Payment

$635.90

$15.90/mo higher

New Loan Term

36 mos

3.0 years fixed

New Interest Rate (APR)

8.99%

Down from 17.79% blended

Total Consolidated Interest

$2,892.40

Total cost: $22,892.40

Current debt cost breakdown

  • Principal$20,000.0071.9%
  • Interest$7,817.3228.1%

Side-by-Side Comparison

MetricCurrent DebtsConsolidated LoanDifference
Total Balance$20,000.00$20,000.00$0.00
Monthly Payment$620.00$635.90+$15.90/mo
Interest Rate (APR)17.79%8.99%-8.80%
Payoff Time52 mos36 mos-16 mos
Total Interest$7,817.32$2,892.40-$4,924.92
Total Cost$27,817.32$22,892.40Save $4,924.92

How we calculated this

Open to see each step from your inputs to the result.

  1. Step 1: Current Debt Portfolio & Blended APR

    Total Balance=∑Balancei=$20,000.00,Current Monthly Payment=$620.00\text{Total Balance} = \sum \text{Balance}_i = \$20,000.00, \quad \text{Current Monthly Payment} = \$620.00

    Summed active balances across all current debts: Credit Card A ($6,000.00) + Credit Card B ($4,000.00) + Personal Loan ($8,000.00) + Store Card ($2,000.00). Weighted average rate is 17.79% APR.

  2. Step 2: Status Quo Payoff & Total Interest

    Total Current Interest=$7,817.32,Max Timeline=52 months\text{Total Current Interest} = \$7,817.32, \quad \text{Max Timeline} = 52 \text{ months}

    Under current payments, existing debts take up to 52 months (4.3 years) to clear, resulting in $7,817.32 in cumulative interest charges.

  3. Step 3: New Consolidated Loan Repayment

    Mnew=P×r(1+r)N(1+r)N−1=$635.90M_{\text{new}} = P \times \frac{r(1+r)^N}{(1+r)^N - 1} = \$635.90

    Consolidated loan of $20,000.00 at 8.99% APR for 36 months requires $635.90/month. Total repayment is $22,892.40 ($2,892.40 total interest and fees).

  4. Step 4: Financial Comparison & Net Savings

    Net Interest Saved=$4,924.92,Monthly Savings=−$15.90\text{Net Interest Saved} = \$4,924.92, \quad \text{Monthly Savings} = -\$15.90

    Consolidating saves $4,924.92 in lifetime interest charges. Monthly payments change by -$15.90/month.

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How debt consolidation works and when it saves money

Debt consolidation is a financial strategy where multiple high-interest debts, such as credit card balances, store cards, high-rate personal loans, or medical bills, are combined into a single new loan with a single monthly payment. When structured properly at a lower interest rate, consolidation reduces your total borrowing costs, accelerates your debt payoff timeline, and simplifies your monthly budgeting.

However, debt consolidation is not a one-size-fits-all solution. If you extend your repayment term too far or incur high origination fees, you might lower your monthly cash outflow while inadvertently paying more total interest over the life of the loan. This debt consolidation calculator compares your existing debts against a new installment loan to reveal your exact monthly savings, lifetime interest reduction, and payoff timeline differences. If you prefer accelerating individual payoffs rather than taking out a new loan, simulate snowball and avalanche strategies with our debt payoff calculator. For broader multi-debt analysis, evaluate your borrowing limits with our debt calculator or check specific revolving balances with our credit card payoff calculator.

Core mathematical formulas of debt consolidation

Evaluating a consolidation loan requires analyzing both your current portfolio of debts and the mechanics of the proposed installment loan.

1. Total debt balance and weighted average interest rate

The combined principal balance is the sum of all individual debt obligations. To understand your true baseline borrowing cost, calculate the weighted average interest rate (blended APR) rather than a simple arithmetic mean:

Total Principal=∑i=1nBi\text{Total Principal} = \sum_{i=1}^{n} B_i
Weighted APR=∑i=1n(Bi×APRi)∑i=1nBi\text{Weighted APR} = \frac{\sum_{i=1}^{n} (B_i \times \text{APR}_i)}{\sum_{i=1}^{n} B_i}

Where BiB_i represents the balance of debt ii, and APRi\text{APR}_i is its annual percentage rate. A consolidation loan must provide an APR lower than your weighted average rate to generate true interest savings under comparable loan terms.

2. Status quo debt payoff timeline and interest

For each individual debt paying monthly amount PiP_i at monthly periodic rate ri=APRi/1200r_i = \text{APR}_i / 1200, the payoff duration in months mim_i follows standard amortization:

mi=ln⁡(PiPi−Bi⋅ri)ln⁡(1+ri)m_i = \frac{\ln\left( \frac{P_i}{P_i - B_i \cdot r_i} \right)}{\ln(1 + r_i)}

If the monthly payment Pi≤Bi⋅riP_i \le B_i \cdot r_i, the payment fails to cover monthly interest. This leads to negative amortization and indefinite debt. For accounts with minimal monthly payments, use our credit card minimum payment calculator to see the danger of minimum payment schedules.

3. Consolidated installment loan payment

When consolidating into an installment loan of term NN months at APR APRnew\text{APR}_{\text{new}} (with monthly rate rnew=APRnew/1200r_{\text{new}} = \text{APR}_{\text{new}} / 1200) and financed principal PnewP_{\text{new}} including any upfront origination fees, the fixed monthly payment MnewM_{\text{new}} is computed via the standard annuity formula:

Mnew=Pnew×rnew(1+rnew)N(1+rnew)N−1M_{\text{new}} = P_{\text{new}} \times \frac{r_{\text{new}}(1 + r_{\text{new}})^N}{(1 + r_{\text{new}})^N - 1}

This formula matches standard fixed-rate lending calculations found in our EMI calculator and advanced loan calculator.

4. Net interest and lifetime savings

Total interest savings compare the cumulative finance charges of your current payments against the total interest and fees of the consolidation loan:

Interest Saved=∑i=1nIi−[(Mnew×N)−Total Principal]\text{Interest Saved} = \sum_{i=1}^{n} I_i - \left[ (M_{\text{new}} \times N) - \text{Total Principal} \right]
Monthly Cash Savings=∑i=1nPi−Mnew\text{Monthly Cash Savings} = \sum_{i=1}^{n} P_i - M_{\text{new}}

Comprehensive worked example

To illustrate the real-world impact of consolidation, consider a borrower managing three separate unsecured liabilities:

  • Credit Card A: $6,000 balance at 22.0% APR, paying $180/month.
  • Credit Card B: $4,000 balance at 18.0% APR, paying $120/month.
  • Personal Loan: $8,000 balance at 13.0% APR, paying $250/month.

Current situation (Status Quo)

  • Total Balance: $18,000 ($6,000 + $4,000 + $8,000)
  • Current Total Monthly Payment: $550/month ($180 + $120 + $250)
  • Weighted Average APR: (6000×22)+(4000×18)+(8000×13)18000=132000+72000+10400018000=17.11%\frac{(6000 \times 22) + (4000 \times 18) + (8000 \times 13)}{18000} = \frac{132000 + 72000 + 104000}{18000} = 17.11\%
  • Individual Payoff Times: Card A takes 52 months, Card B takes 45 months, Personal Loan takes 43 months (Maximum tenure = 52 months).
  • Total Interest Paid: $3,357.66 (Card A) + $1,349.52 (Card B) + $2,113.91 (Loan) = $6,821.09.
  • Total Current Cost: $18,000 principal + $6,821.09 interest = $24,821.09.

Consolidation Scenario: 36-Month Loan @ 9.0% APR (0% origination fee)

By securing a 3-year personal consolidation loan at 9.0% APR:

  • New Monthly Payment: $18,000×0.0075(1.0075)36(1.0075)36−1=$572.40 / month\$18{,}000 \times \frac{0.0075(1.0075)^{36}}{(1.0075)^{36} - 1} = \$572.40\text{ / month}
  • Total Repayment: $572.40 x 36 = $20,606.40.
  • Total Consolidated Interest: $20,606.40 - $18,000 = $2,606.40.
  • Net Lifetime Interest Saved: $6,821.09 - $2,606.40 = $4,214.69 in savings.
  • Payoff Speed: Debt free in 36 months instead of 52 months (16 months faster).

Alternative Scenario: 60-Month Loan @ 9.0% APR (Lower Monthly Payment Focus)

If the borrower needs immediate monthly cash flow relief, a 5-year loan changes the dynamic:

  • New Monthly Payment: $373.65/month.
  • Monthly Cash Flow Relief: $550.00 - $373.65 = $176.35/month saved in cash flow.
  • Total Repayment: $373.65 x 60 = $22,419.00 ($4,419.00 total interest).
  • Net Lifetime Interest Saved: $6,821.09 - $4,419.00 = $2,402.09 in interest savings.

Common debt consolidation methods

1. Fixed-rate personal loans

Unsecured installment loans with terms typically spanning 24 to 84 months. They provide predictable fixed monthly payments and set payoff dates without risking collateral. To calculate revolving interest charges, check our credit card interest calculator.

2. 0% APR balance transfer credit cards

Cards offering 0% promotional APR for 12 to 21 months. Excellent for short-term payoff, but watch out for 3% to 5% balance transfer fees and steep standard APRs after the promotional window expires.

3. Home equity loans / HELOCs

Borrowing against accumulated home equity generally offers the lowest interest rates. However, your home acts as collateral, introducing foreclosure risk if you fail to repay.

4. 401(k) retirement loans

Borrowing from employer retirement plans where interest is paid back to yourself. While accessible without credit checks, you lose out on market compounding and risk tax penalties if employment terminates before repayment.

Frequently asked questions

How do I know if debt consolidation will actually save me money?
Consolidation saves money when the new loan APR (plus any origination fees) is noticeably lower than your current weighted average APR, and the loan term does not stretch payments so far into the future that total interest climbs. Use this calculator to compare total repayment costs directly.
What credit score is typically required for an unsecured debt consolidation loan?
Most mainstream lenders look for a credit score of 660 or higher (good to excellent credit) to offer interest rates below 10% to 12%. Borrowers with fair credit (580 to 659) may still qualify, but higher interest rates and origination fees might reduce overall savings.
What are origination fees, and how do they affect consolidation savings?
An origination fee is an upfront processing charge by the lender, usually ranging between 1% and 8% of the loan amount. It is deducted from the disbursed cash or rolled into the principal balance. Always factor origination fees into your total borrowing cost to ensure true net savings.
Will debt consolidation hurt my credit score?
In the short term, applying for a new loan creates a hard inquiry, which can dip your score by a few points. However, using the loan to pay off revolving credit cards dramatically lowers your credit utilization ratio, which often leads to a substantial credit score increase within a few billing cycles.
Can I consolidate debt if I am already struggling with missed payments?
If you have already missed payments or carry delinquent accounts, qualifying for competitive personal loan rates becomes difficult. In that situation, non-profit credit counseling agencies offer Debt Management Plans (DMPs) that negotiate lower interest rates directly with existing creditors without taking out new debt.
What is the difference between debt consolidation and debt settlement?
Debt consolidation pays off all existing creditors in full with a new loan, maintaining your credit standing. Debt settlement involves stopping payments, negotiating with creditors to accept less than what is owed, and severely damaging your credit score while incurring taxable cancellation-of-debt income.

Resources and references

The formulas and methods in this calculator were checked against these independent sources.